Substitute a character with sed Post: 303032480

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Top Forums UNIX for Beginners Questions & Answers Substitute a character with sed Post 303032480 by stomp on Tuesday 19th of March 2019 05:55:37 AM

03-19-2019

Registered User

Thanks all for the participation.

I hope I did not make my statements in the way they are the truth, but just did show them as my own preferences(e. g. the statement that "Shell scripting is now programming language") . Others may have other preferences. (@Bakunin: I'm sure you have a great script library of portable scripts he can use when he needs them in any environment).

In overall my views have not changed. Portability may be an important goal in writing scripts. But one does not get it for free. And it's not cheap, because it impacts other objectives one might have in programming, which may be...

Ease of programming
Efficiency of Resources
Security
Robustness
Maintainability/Readability
Slim Programming Runtime Environment

But one can do easy things to keep portability and need not to break it lightly (Using BRE instead of ERE,...).

Despite being a bit interested in standardization, I was only reading news about that topic here and there. Thanks for the details Don. I gave up on that 20 years ago. Linux is absolutely great in terms of standardization like every distribution has it's own standard. (See xkcd: Standards). Just kidding. The linux folks are not even able to get together in which file the hostname of the system should reside. In the end the decision was made by using systemd which had it at the fixed location /etc/hostname.

In all my time it has never come to a common way e. g. to configure persistent networking. There are about 50 different ways to do it.

Quote:

Originally Posted by jim mcnamara

Speaking strictly as a scientist: python ruby, and julia are extremely important for research and analysis.

I do not know that. But I assume, you know what you are speaking of. The question for me is, what is needed as a runtime which is needed as a base - as a compatibility layer. I think it's not that good to have 100 GB of every possible and well working programming language installed in every system. I would rather like to have that base not too fat.

Last edited by stomp; 03-21-2019 at 01:50 PM..

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LEARN ABOUT LINUX

shtool-subst

SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

NAME

       shtool-subst - GNU shtool sed(1) substitution operations

SYNOPSIS

       shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
       [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]

DESCRIPTION

       This command applies one or more sed(1) substitution operations to stdin or any number of files.

OPTIONS

       The following command line options are available.

       -v, --verbose
	   Display some processing information.

       -t, --trace
	   Enable the output of the essential shell commands which are executed.

       -n, --nop
	   No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.

       -w, --warning
	   Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
	   operations resulted in no content change on all files.

       -q, --quiet
	   Suppress warning on substitution operation resulting in no content change.

       -s, --stealth
	   Stealth operation. Preserve timestamp on file.

       -i, --interactive
	   Enter interactive mode where the user has to approve each operation.

       -b, --backup ext
	   Preserve backup of original file using file name extension ext.  Default is to overwrite the original file.

       -e, --exec cmd
	   Specify sed(1) command directly.

       -f, --file cmd-file
	   Read sed(1) command from file.

EXAMPLE

	#   shell script
	shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]

	#    RPM spec-file
	%install
	    shtool subst -v -n 
		-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' 
		-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' 
		`find . -name Makefile -print`
	    make install

HISTORY

       The GNU shtool subst command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 2001 for GNU shtool.  It was prompted
       by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.

SEE ALSO

       shtool(1), sed(1).

18-Jul-2008							   shtool 2.0.8 					       SHTOOL-SUBST.TMP(1)